﻿using System;

namespace Helloworld
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");
            int grade = 2020;
            string name = "刘珺瑶";
            Console.WriteLine("你好！我是{0}级{1}。",grade,name);
        }
    }
}
